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Implement zip.editCond (#89)

Utility function that mimics the behavior of transformers: a way to walk the element tree and perform edits for given patterns.

The function has the signature:
```javascript
editCond :: patterns -> loc -> loc
```
Where patterns is an array of `[pattern, editFn]` touples.
A pattern can be either a function, in which case it is treated as a predicate; alternatively it can be an element kind expression, in which case it will match all elements of that kind.

e.g.
```javascript
zip.editCond(
  [
    [e => e.has('property'), e => e.set('updated', true),
    ['__read',  e => e.set('isRead', true),
    [['document', 'article'], e => e.set('isDocumentArticle', true)
  ],
 initialLocation
)
```

Closes #81

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